How long is an age Like in Lord of the Rings?

Age, astrological - A period of about 2,150 years, or one-twelfth of the Great Year of approximately 25,800 years. It represents the time required for the vernal equinox to retrograde through the thirty-degree arc of one constellation. According to many astrologers, the Earth is now moving from the Piscean Age into the Aquarian Age.